致力于高效的气生产:的固体溶液对-铁氧化OER催化剂的影响
Lamea Abbas1, Lakhanlal2, Sourav Bhowmick1
1The Wolfson Department of Chemical Engineering, Technion- Israel Institute of Technology, Haifa 3200003, Israel.
概括
组无金属催化剂对于成本效益高的生产至关重要. 一种新的NiFeW-(OH) 2催化剂证明了增强的氧化演化反应性能,为高效的水分裂技术铺平了道路.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
背景情况:
- 开发无金组金属 (无PGM) 催化剂对于通过水分解可负担的气生产至关重要.
- 氧化演化反应 (OER) 是水电解中的一个关键瓶.
研究的目的:
- 为氧化演化反应 (OER) 合成和表征一种新的三金属NiFeW-(OH) 2催化剂.
- 研究合和热处理对催化剂电化学性能的影响.
- 评估催化剂在离子交换膜水电解器 (AEM-WE) 中的活性.
主要方法:
- 电化学方法,包括循环电压测量和时测量.
- 用于结构分析的X射线衍射 (XRD).
- 用于电子结构的X射线光辐射光谱仪 (XPS).
- 电化学阻抗光谱 (EIS) 与放松时间 (DFRT) 的分布函数.
- 密度函数理论 (DFT) 的计算.
- 阳离子交换膜水电解仪 (AEM-WE) 的测试.
主要成果:
- 与赤裸的铁相比,NiFeW-(OH) 2催化剂表现出优越的OER性能,其动力学得到了改进,阻力降低.
- 添加扩大了晶格,降低了结合能,增强了催化活性.
- 优化的催化剂在AEM-WE.中实现了高电流密度 (2.12 A cm-2在~2.0 V)
- DFT确定铁是主要活性部位,DFRT分析证实了在降低电荷转移阻力方面的作用.
结论:
- 三金属NiFeW-(OH) 2催化剂代表了氧气演化反应的有希望的无PGM电催化剂.
- 通过修改电子结构和降低电荷转移阻力,在增强催化活性方面发挥着至关重要的作用.
- 催化剂显示了通过水分的高效和成本效益的生产的巨大潜力.
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